[LLVM] Remove leftover unnecessary CMake for GPU runtimes

Summary:
This somehow snuck back in.

Author: jhuber6

llvm/cmake/modules/HandleLLVMOptions.cmake

@@ -144,14 +144,6 @@ if( LLVM_ENABLE_ASSERTIONS )
   endif()
 endif()
 
-# If we are targeting a GPU architecture in a runtimes build we want to ignore
-# all the standard flag handling.
-if("${LLVM_RUNTIMES_TARGET}" MATCHES "^amdgcn" OR
-   "${LLVM_RUNTIMES_TARGET}" MATCHES "^nvptx64")
-  return()
-endif()
-
-
 if(LLVM_ENABLE_EXPENSIVE_CHECKS)
   # When LLVM_ENABLE_EXPENSIVE_CHECKS is ON, LLVM will intercept errors
   # using assert(). An explicit check is performed here.